利用三弯矩法解无侧移刚架

Using Three Moment Method to Solve the Rigid Frame without Lateral Displacement

三弯矩法是用来解多跨连续梁在荷载和支座沉降作用下内力的一种简单方法。无侧移刚架从外形上看似乎不符合三弯矩法的条件,但从受力本质上看,无侧移刚架可以看成是多跨连续梁"弯折"后形成的。因此,介绍支座沉降作用下的三弯矩方法,将无侧移刚架等效成多跨连续梁,利用三弯矩法解无侧移刚架,用一个算例验证三弯矩法可以用来解决无侧移刚架问题。

The three moment method is a simple method to solve the internal force of multi span continuous beam under the action of load and bearing settlement.It seems that the rigid frame without lateral displacement does not meet the conditions of the three moment method from the appearance,but in the nature of stress,the rigid frame without lateral displacement can be seen as the formation of multi span continuous beams after "bending".In this paper,the three moment method under the action of bearing settlement is introduced firstly,then the non side moving rigid frame is equivalent to a multi span continuous beam,and the three moment method is used to solve the non side moving rigid frame.Finally,an example is used to verify that the three moment method can be used to solve the non side moving rigid frame problem.